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Thanks CJF. That makes sense, especially since the numbering is from pre 5 digit system. You don't happen to know a source for the codes of the other Kosta designers from that era, apart from Lindstrand?

Following on from that does anybody know what 'Sa. S' means. I'm pretty sure it's a Mona M-S piece, it's a two colour bowl with mirror cuts, but I cant work out (or find another example of) the 'Sa' part.

Full mark is 'Kosta Sa. S 5775'

Could you post a picture? I suspect that this one could possibly be by Owe Sandeberg...

After this thread, I realised I had forgotten a great deal about Kosta (and everything else) so I went back to read 'Kosta 250," the book produced as part of Kosta's 250th anniversary. It seems that there was even greater variation in the signature system than I thought, particularly in the late 50's/60's. For example, they have examples of Ventana with no code and signed Mona Morales, Mona Schildt, and Mona Morales-Schildt. The book lists every master blower and cutter who records say worked at Kosta and yet it doesn't provide a list of the code numbers for the designers.